Suzhou Huadian's series of products, "New Series Resonance High Voltage Test Device", has a number of patented technologies such as "a high voltage output control device for series resonance withstand voltage test" and "self-balancing resonant reactor", and has formed an industry It has been recognized as a high-tech product in Jiangsu Province (No. 080506C0429N). This product is divided into two categories: square wave ordinary frequency conversion power supply and sine wave non-partial discharge frequency conversion power supply; it has portable series and large capacity UHV series. The voltage level is from 20kV to 10000 kV, the capacity is from 50kVA to 10000 kVA, the frequency is from 20 to 400Hz, and the partial discharge is less than 5pC.